Description : Which causes a quantization noise in PCM system? A. Serial transmission errors B. The approximation of the quantized signal C. The synchronization between encoder and decoder D. Binary coding techniques
Last Answer : B. The approximation of the quantized signal
Last Answer : The approximation of the quantized signal
Description : It is used to encode the minimum amount of speech information necessary to reproduce a perceptible message with a fewer bits that those needed by a conventional encoder/decoder
Last Answer : vocoders
Description : Used for transmission of PCM encoded time – division multiplexed digital signal.
Last Answer : T carriers
Description : A theory that establishes the minimum sampling rate that can be used for a given PCM systems.
Last Answer : Nyquist sampling theorem
Description : A theory that establishes the minimum sampling rate that can be used for a given PCM systems
Description : An integrated circuit that performs the PCM encoding and decoding functions
Last Answer : Codec
Description : Involves compression in the transmitter after the input sample has been converted to a linear PCM code and then expansion in the receiver prior to PCM coding:
Last Answer : Digital companding
Description : The PCM code for each channel occupies a fixed time slot called:
Last Answer : Epoch
Description : The main advantage of DM over PCM is:
Last Answer : simple circuit
Description : In PCM, it converts the PAM sampled to parallel PCM codes
Last Answer : Analog-to-Digital converter
Description : The most common method used for sampling voice signals in PCM systems.
Last Answer : flat top sampling
Description : Type of PCM which is designed to take advantage of the sample-to-sample redundancies in the typical speech waveform
Last Answer : Differential PCM
Description : Numerical indication of how efficiently a PCM code is utilized
Last Answer : Coding efficiency
Description : Classification of protocol that interprets a frame of data as a group of successive bit combined into predetermined pattern of fixed length, usually 8 bits each.
Last Answer : Character and Byte-oriented protocols
Description : Quantization noise is caused by A. binary coding techniques B. serial transmission errors C. the synchronization between encoder and decoder D. the approximation of the quantized signal
Last Answer : D. the approximation of the quantized signal
Description : An IC that contains A/D and D/A converters, companders, and parallel-to-serial converters is called
Last Answer : . Codec
Description : To permit the selection of 1 out of 16 equiprobable events, the number of bits required is
Last Answer : 4
Description : It is the ratio of the transmission bit rate to the minimum bandwidth required for a particular modulation scheme
Last Answer : Bandwidth efficiency, Information density, or Spectral efficiency
Description : For the 16-PSK and a transmission system with a 10kHz bandwidth, determine the maximum bit rate
Last Answer : 40,000 bps
Description : Rate of change of a signal on a transmission medium after encoding and modulation have occurred
Last Answer : baud rate
Description : The characters making up the message in a synchronous transmission are collectively referred to as the data
Last Answer : block
Description : A transmission of binary data which involves the transmission of two non – zero voltage level
Last Answer : Bipolar
Description : Category of data transmission if the binary pulse is maintained for the entire bit time?
Last Answer : Return to zero
Description : A special type of transmission line that consist of conducting metallic tube through which high frequency electromagnetic energy is propagated
Last Answer : waveguide
Description : The point on the antenna where the transmission line is connected is called _____
Last Answer : feedpoint
Description : How many 8-bit characters can be transmitted per second over a 9600 baud serial communication link using asynchronous mode of transmission with one start bit, eight data bits, two stop bits, and one parity bit ? a. 600 b. 800 c. 876 d. 1200
Last Answer : b. 800
Description : In the ________ traffic model, the rate of the data flow changes in time, with the changes smooth instead of sudden and sharp.
Last Answer : variable bit rate
Description : The ________ is a function of three values: average data rate, peak data rate, and maximum burst size.
Last Answer : Effective bandwidth
Description : Set rules implementing and governing an orderly exchange of data between layers of two devices, such as line control units and front – end processors.
Last Answer : Data Link Protocol
Description : A synchronous transmission usually begins with which character
Last Answer : SYN
Description : It involves converting standard logic levels to a form more suitable to telephone transmission lines
Last Answer : igital line encoding
Description : A synchronous transmission usually begins with which character?
Description : It is the transmission of information in any form from one source to one or more destination.
Last Answer : Multiplexing
Description : Synchronous transmission is used because:
Last Answer : no start and stop bits means higher efficiency
Description : Ethernet is baseband transmission system designed by _____
Last Answer : Robert Metcalfe and David Boggs
Description : They experimented with light transmission cables through bundle of fibers and lead to the development of flexible fiberscope
Last Answer : Van Heel, Hopkins and Kapany
Description : __________ defines how a user gets control of the channel so as to allow transmission.
Last Answer : channel access
Description : does its best to get a transmission through to its destination, but with no guarantees
Last Answer : best-effort delivery
Description : How many bytes of data can be sent in 15 seconds over a serial link with baud rate of 9600 in asynchronous mode with odd parity and two stop bits in the frame? a. 10,000 bytes b. 12,000 bytes c. 15,000 bytes d. 27,000 bytes
Last Answer : b. 12,000 bytes
Description : ECE Board Exam March 1996 What is the transmission rate of a system for transmitting the output of a microcomputer to a line printer operating at a speed of 30 lines/minute? Assume that the line printer has 8 bits ... and prints out 80 characters/line. A. 800 bps B. 400 bps C. 320 bps D. 640 bps
Last Answer : C. 320 bps
Description : What is the minimum number of bits required in a PCM code for a range of 10,000? A. 12 B. 9 C. 14 D. 10
Last Answer : C. 14
Description : How many bits are required to encode 32 level PCM: (1) 6 (2) 5 (3) 4 (4) 3
Last Answer : 5 bits are required to encode 32 level PCM.
Description : The upper pulse rate and information carrying capacity of a cable is limited by:
Last Answer : modal dispersion
Description : Picture frames are repeated at the rate of ___ per second
Last Answer : . 30
Description : The result whenever the sampling rate is less than twice the highest audio frequency.
Last Answer : alias
Last Answer : 30
Description : It is the symmetrical expectation of the bit error rate in the system.
Last Answer : probability of errors
Description : n T1, it is equal to the reciprocal of the sample rate
Last Answer : Frame time